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Competing theoretical claims exist in the literature on the effect of proportionality on political trust. To date, empirical studies yielded mixed results. In this paper, we examine a curvilinear effect of the proportionality of election outcomes on political trust using data from the European Social Survey (2006–2009). The findings show that political trust is indeed highest in countries with very proportional as well as in countries with very disproportional election outcomes and lowest in countries that fall in between. Election outcomes that are more fully inclusive and those that provide more accountability can both lead to higher levels of political trust. Next to the proportionality of the translation of votes into seats, this study investigates a broad range of election outcomes that are associated with (dis)proportionality i.e. the effect of the number of parties in elections, parliament and government, voting for the winning or losing party under different levels of proportionality and the clarity of responsibility.
